subtle.importKey(format, keyData, algorithm, extractable, keyUsages)
format：<string> 必须是'raw'、'pkcs8'、'spki'或'jwk'中的一个。keyData：<ArrayBuffer> | <TypedArray> | <DataView> | <Buffer> | <Object>
algorithm：<AlgorithmIdentifier> | <RsaHashedImportParams> | <EcKeyImportParams> | <HmacImportParams>
extractable：<boolean>keyUsages：<string[]> 见主要用途。- 返回：<Promise> 包含 <CryptoKey>
subtle.importKey() 方法尝试将提供的 keyData 按给定的 format 进行解析，以使用提供的 algorithm、extractable 和 keyUsages 参数创建一个 <CryptoKey> 实例。如果导入成功，返回的 promise 将会被解析为创建的 <CryptoKey>。
🌐 The subtle.importKey() method attempts to interpret the provided keyData
as the given format to create a <CryptoKey> instance using the provided
algorithm, extractable, and keyUsages arguments. If the import is
successful, the returned promise will be resolved with the created <CryptoKey>.
如果导入 'PBKDF2' 密钥，extractable 必须为 false。
🌐 If importing a 'PBKDF2' key, extractable must be false.
目前支持的算法包括：
🌐 The algorithms currently supported include:
| Key Type | 'spki' | 'pkcs8' | 'jwk' | 'raw' |
|---|---|---|---|---|
'AES-CBC' | ✔ | ✔ | ||
'AES-CTR' | ✔ | ✔ | ||
'AES-GCM' | ✔ | ✔ | ||
'AES-KW' | ✔ | ✔ | ||
'ECDH' | ✔ | ✔ | ✔ | ✔ |
'X25519' 1 | ✔ | ✔ | ✔ | ✔ |
'X448' 1 | ✔ | ✔ | ✔ | ✔ |
'ECDSA' | ✔ | ✔ | ✔ | ✔ |
'Ed25519' 1 | ✔ | ✔ | ✔ | ✔ |
'Ed448' 1 | ✔ | ✔ | ✔ | ✔ |
'HDKF' | ✔ | |||
'HMAC' | ✔ | ✔ | ||
'PBKDF2' | ✔ | |||
'RSA-OAEP' | ✔ | ✔ | ✔ | |
'RSA-PSS' | ✔ | ✔ | ✔ | |
'RSASSA-PKCS1-v1_5' | ✔ | ✔ | ✔ |